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Cheap flights from District of Columbia to Ko Samui from $711

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from District of Columbia to Ko Samui departing on 6/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from District of Columbia to Ko Samui

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:10 pm - 8:15 am
IAD
-
USM
30h 05m
2 stops
Multiple Airlines Logo
6:00 am - 9:45 am
USM
-
IAD
38h 45m
2 stops
$1,143Multiple Airlines
Sat, May 9 - Sun, May 17
Etihad Airways Logo
3:10 pm - 10:30 am
IAD
-
USM
32h 20m
2 stops
Etihad Airways Logo
5:25 pm - 9:45 am
USM
-
IAD
27h 20m
2 stops
$1,254Etihad Airways
Mon, Aug 3 - Mon, Aug 10
Multiple Airlines Logo
3:10 pm - 7:30 am
IAD
-
USM
29h 20m
2 stops
Multiple Airlines Logo
6:00 am - 9:45 am
USM
-
IAD
38h 45m
2 stops
$1,302Multiple Airlines
Sun, Apr 19 - Fri, Apr 24
Multiple Airlines Logo
3:10 pm - 8:50 pm
IAD
-
USM
42h 40m
2 stops
Multiple Airlines Logo
3:50 pm - 9:45 am
USM
-
IAD
52h 55m
2 stops
$1,325Multiple Airlines
Thu, Apr 9 - Thu, Apr 16
Turkish Airlines Logo
9:45 pm - 1:10 pm
IAD
-
USM
28h 25m
2 stops
Turkish Airlines Logo
1:30 pm - 11:35 am
USM
-
IAD
33h 05m
2 stops
$1,335Turkish Airlines
Sun, Apr 12 - Sun, Apr 19
Etihad Airways Logo
3:10 pm - 6:15 pm
IAD
-
USM
40h 05m
2 stops
Etihad Airways Logo
8:55 am - 9:45 am
USM
-
IAD
59h 50m
2 stops
$1,383Etihad Airways
Wed, Apr 8 - Wed, Apr 15
Multiple Airlines Logo
5:00 pm - 7:40 pm
DCA
-
USM
39h 40m
2 stops
Multiple Airlines Logo
11:55 am - 8:00 pm
USM
-
DCA
43h 05m
2 stops
$1,418Multiple Airlines
Thu, Apr 9 - Thu, Apr 16
Multiple Airlines Logo
3:46 pm - 7:40 pm
DCA
-
USM
40h 54m
2 stops
Multiple Airlines Logo
11:55 am - 3:52 pm
USM
-
DCA
38h 57m
2 stops
$1,505Multiple Airlines
Fri, Apr 10 - Fri, Apr 17
Cathay Pacific Logo
11:58 am - 7:40 pm
DCA
-
USM
44h 42m
2 stops
Cathay Pacific Logo
11:55 am - 12:30 am
USM
-
DCA
47h 35m
2 stops
$1,571Cathay Pacific
Sun, Apr 19 - Fri, Apr 24
Cathay Pacific Logo
3:21 pm - 7:40 pm
DCA
-
USM
65h 19m
2 stops
Cathay Pacific Logo
11:55 am - 7:05 pm
USM
-
DCA
42h 10m
2 stops
$1,713Cathay Pacific
Sat, Apr 4 - Sat, Apr 11

Etihad Airways flights from District of Columbia to Ko Samui

Our best Etihad Airways deals on District of Columbia to Ko Samui flight tickets
Etihad Airways
Aug 3
IAD3:10 pmWashington, D.C. Dulles Intl
32h 20m
2 stops
USM10:30 amKo Samui
Aug 10
USM5:25 pmKo Samui
27h 20m
2 stops
IAD9:45 amWashington, D.C. Dulles Intl
$1,254
Etihad Airways
Apr 8
IAD3:10 pmWashington, D.C. Dulles Intl
40h 05m
2 stops
USM6:15 pmKo Samui
Apr 15
USM8:55 amKo Samui
59h 50m
2 stops
IAD9:45 amWashington, D.C. Dulles Intl
$1,383
Etihad Airways
Apr 4
IAD3:10 pmWashington, D.C. Dulles Intl
40h 05m
2 stops
USM6:15 pmKo Samui
Apr 11
USM8:55 amKo Samui
59h 50m
2 stops
IAD9:45 amWashington, D.C. Dulles Intl
$1,826

Cathay Pacific flights from District of Columbia to Ko Samui

Our best Cathay Pacific deals on District of Columbia to Ko Samui flight tickets
Cathay Pacific
Apr 19
DCA11:58 amWashington, D.C. Reagan-National
44h 42m
2 stops
USM7:40 pmKo Samui
Apr 24
USM11:55 amKo Samui
47h 35m
2 stops
DCA12:30 amWashington, D.C. Reagan-National
$1,571
Cathay Pacific
Apr 4
DCA3:21 pmWashington, D.C. Reagan-National
65h 19m
2 stops
USM7:40 pmKo Samui
Apr 11
USM11:55 amKo Samui
46h 05m
2 stops
DCA11:00 pmWashington, D.C. Reagan-National
$1,713
Cathay Pacific
Apr 4
IAD5:52 pmWashington, D.C. Dulles Intl
38h 48m
2 stops
USM7:40 pmKo Samui
Apr 11
USM11:55 amKo Samui
46h 31m
2 stops
IAD11:26 pmWashington, D.C. Dulles Intl
$1,785

momondo Fare Finder

 
Customize your flight search to find flights from District of Columbia to Ko Samui that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 26, 2026.
Use the filters below to find and compare flights from District of Columbia to Ko Samui that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sat 5/9

3:10 pm-8:15 am

2 stops30h 05m

Ko Samui

Sun 5/17

6:00 am-9:45 am

2 stops38h 45m

$1,143

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Mon 8/3

3:10 pm-10:30 am

2 stops32h 20m

Ko Samui

Mon 8/10

5:25 pm-9:45 am

2 stops27h 20m

$1,254

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sun 4/19

3:10 pm-7:30 am

2 stops29h 20m

Ko Samui

Fri 4/24

6:00 am-9:45 am

2 stops38h 45m

$1,302

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Thu 4/9

3:10 pm-8:50 pm

2 stops42h 40m

Ko Samui

Thu 4/16

3:50 pm-9:45 am

2 stops52h 55m

$1,325

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Sun 4/12

9:45 pm-1:10 pm

2 stops28h 25m

Ko Samui

Sun 4/19

1:30 pm-11:35 am

2 stops33h 05m

$1,335

Washington, D.C.Ko Samui

IAD - USM

IADUSM

Washington, D.C. Dulles Intl

Wed 4/8

3:10 pm-6:15 pm

2 stops40h 05m

Ko Samui

Wed 4/15

8:55 am-9:45 am

2 stops59h 50m

$1,383

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Thu 4/9

5:00 pm-7:40 pm

2 stops39h 40m

Ko Samui

Thu 4/16

11:55 am-8:00 pm

2 stops43h 05m

$1,418

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Fri 4/10

3:46 pm-7:40 pm

2 stops40h 54m

Ko Samui

Fri 4/17

11:55 am-3:52 pm

2 stops38h 57m

$1,505

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Sun 4/19

11:58 am-7:40 pm

2 stops44h 42m

Ko Samui

Fri 4/24

11:55 am-12:30 am

2 stops47h 35m

$1,571

Washington, D.C.Ko Samui

DCA - USM

DCAUSM

Washington, D.C. Reagan-National

Sat 4/4

3:21 pm-7:40 pm

2 stops65h 19m

Ko Samui

Sat 4/11

11:55 am-7:05 pm

2 stops42h 10m

$1,713

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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See travel insights to Ko Samui from

How to get the cheapest flight ticket from District of Columbia to Ko Samui

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Ko Samui?

Our data shows that Wednesday is the least expensive day to fly to Ko Samui. Tickets to fly out on this day can be as low as $325. Flights from District of Columbia to Ko Samui on a Sunday will generally be more expensive and average around $714. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Ko Samui?

Our data shows that the cheapest District of Columbia to Ko Samui flights are usually those with departure times in the evening. Our users have found flights to Ko Samui in the evening for as low as $286. At noon is when there is more demand to fly to Ko Samui, so prices are often more expensive at around $399 per ticket.

Cheap District of Columbia to Ko Samui flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from District of Columbia to Ko Samui

Fastest flight time

27h 15m

Direct flights

None
The fastest flight from District of Columbia to Ko Samui takes 27h 15m
There are no direct flights from District of Columbia to Ko Samui. There are no popular flight routes from District of Columbia to Ko Samui.
Search flight deals

  • When did momondo last update prices for flights from District of Columbia to Ko Samui Airport?

    Prices for flights from District of Columbia to Ko Samui Airport refresh daily.

  • How old do you have to be to fly from District of Columbia to Ko Samui Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from District of Columbia to Ko Samui Airport.

  • What documentation or ID do you need to fly to Ko Samui Airport?

    The travel and health documents required for your trip to Ko Samui Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ko Samui Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan
Khanom

Why use momondo?

Why should I use momondo to find a flight deal from District of Columbia to Ko Samui?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from District of Columbia to Ko Samui. momondo saves you time and could save you money on your trip.

Can I find flights from District of Columbia to Ko Samui with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Ko Samui from District of Columbia with this policy.

How can momondo help me find flights from District of Columbia to Ko Samui?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ko Samui from District of Columbia.

I’m not ready to book a flight from District of Columbia to Ko Samui right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of District of Columbia to Ko Samui flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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